Derrick-swinging mechanism.



0. mmmmsom DERRICK SWINGING MECHANISM.

APPLIOATIOR rum) APR. 2 1908' Patented Nov. 17, 1908.

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UNITED STATES PATENT oFEroE.

OSCAR J. MARTINSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO MONIGHAN MACHINE COMPANY, OF CHICAGO, ILLINOIS.

DE RRICKSWINGING ME CHAN ISM.

Specification of Letters Patent.

Patented Nov. 17, 1908.

Application filed April 24, 1908. Serial No. 428,994.

To all whom it may concern:

Be it known that I, Osoan J. MARTINSON, a citizen of the United States of America, and a resident of Chicago, Cook county, State of Illinois, have invented certain new and useful Improvements in Derrick-Swinging Mechanisms, of which the following is a specification.

The main objects of this invention are to provide an improved form of winch drum particularly suited for swinging the booms of rotary derricks and capable of taking up the slack in the cables while they are under strain; and to provide an improved form of winch drum comprising two sections which are relatively adjustable around the shaft to any desired degree. These objects are accomplished by the device shown in the accompanying drawings, in which Figure 1 is a longitudinal section of a double drum winch constructed according to this invention and particularly designed for swinging the boom of a rotating derrick. Fig. 2 is a diagrammatic view, showing the method of connecting the cable with the drums of the winch.

In the form shown in the drawings, two drums l and 2 are mounted 011 the shaft 3 in alinement with each other. The drum 1 is rigid on the shaft, and the drum 2 is loose on the shaft. The shaft is rotated by a driving member 4:, represented in the form of a gear which is located at one end of the loose drum The drums preferably have grooved peripheries for winding a wire cable.

The loose drum 2 is provided with an annual series of ratchet teeth or stops 5. A dog or pawl 6 is mounted in convenient position upon the supporting frame for engaging the stops 5 to lock the drum 2 against rotation. This dog is shown engaged with the stops for clearness of the illustration, although it would only be in such position at times when the slack in the cable is being taken up, as will hereinafter appear. The gear at is provided, on its face which is adjacent to the drum 2, with a conical friction surface 7 which fits a conical friction surface 8 on the drum 2.

The drum 2 has a groove 9 cut in its face adjacent to the gear 4, said groove being enlarged in its interior and having a contracted slot opening toward the gear 4:.

Bolts 10 extend through the web or arms of the gear 4 and have their heads seated in said groove 9. The shoulders 11 at the edges of said slot engage the heads of the bolts 10 in such manner that the drum 2 will be drawn toward the gear I so as to force the friction surfaces 7 and 8 into driving engagement with each other when the bolts 10 are drawn up tight by means of their nuts. The bolts 10 are equidistant from the axis of the shaft 3, and the groove 9 is large enough to permit the heads of the bolts 10 to travel in said groove 9 when the bolt-s are loosened by turning back the nuts 10.

In Fig. 2 of the drawings, the mast of the derrick is indicated at 12, and the bull-wl1eel by means of which said mast is rotated for swinging the boom of the derrick (not shown) is designated 18. The cable 14 passes around the grooved periphery of the bullwheel, and its ends are respectively wound in opposite directions around the drums 1 and 2.

The operation of the device shown is as follows :-lVhen the drum 2 is locked in driving engagement with the gear 4, the parts are in their normal operating positions, the dog 6 being out of engagement with the teeth 5 on the drum 2. Then by rotating the shaft 8 in either direction, one end of the cable is unwound from one drum while the other end is wound up an equal extent upon the other drun This rotates the bull-wheel 13 and swings the boom of the derrick. It is of importance that the cable be devoid of slack and be at all times sufficiently taut to permit of reversing the direction of rotation of the bull-wheel without lost motion or erk.

WVhen it is desired to take up slack in the cable 14:, the nuts on the bolts 10 are loosened so as to release the driving grip of the friction surfaces 7 and S, and the dog 6 is thrown into engagement with the teeth 5 on the drum 2. If power is now applied to the shaft 3, the drum 2 will be held stationary by the dog 6, and the drum 1 will be driven so as to take up the slack and exert a. strain upon the cable. Then by tightening the bolts 10, the drum 2 is drawn firmly into driving engagement with the gear 4. After the dog 6 is released, the device is again ready for normal operation. This arrangement permits of taking up'every bit of the slack, however slight.

WVhat I claimas my invention and desire to secure by Letters Patent is':'

1. The combination of a shaft, a drum fixed thereon, a wheel fixed on said shaft, a second drum loosely mounted on said shaft between said wheel and first drum, dogging means adapted to lock said loose drum against rotation with said shaft, said wheel and loose drum being provided with opposed friction surfaces, and means for locking said friction surfaces into driving engagement with each other.

2. The combination of a shaft, a drum fixed thereon, a wheel fixed on said shaft, a

second drum loosely mounted on said shaft between said wheel and first drum, said wheel and loose drum being provided with opposed friction surfaces, means for locking said friction surfa'ces into driving engage-' ment with each other, an annular series of teeth mounted in fixed relation with said loose drum, and a dog adapted to engage said friction surfaces into driving engage ment with each other.

4. Thecombination of a shaft, a drum fixed thereon, a memberfixed on said shaft and spaced away from said fixed drum, a second drum loosely mounted between said member and fixed drum, said member and loose drum having co-acting friction surfaces, a plurality of bolts secured to said member and spaced substantially equidistant from the axis of said shaft, the heads of said bolts being adjacent to said loose drum, and an annular shoulder on said drum adapted to engage said heads and draw said member and loose drum into driving engagement with each other when said bolts are tightened, and to permlt the free rela- .tive rotation of said drum and member when said bolts are. loosened.

5. The combination of a shaft, a winch drum fixed thereon, a second winch drum loose on said shaft, co-acting friction surfaces arranged to lock said loose drum to said shaft, and a series of bolts disposed longitudinally of the shaft and adapted to draw said friction surfaces into driving engagement with each other, said bolts having sliding connection with one of said parts whereby said loose drum will be free to rotate relatively of the fixed drum when saidbolts are loosened.

6. The combination of a shaft, a winch drum fixed thereon, a second winch drum loose on said shaft, co-act-ing friction surfaces arranged to lock said loose drum to said shaft, and a series, of bolts disposed longitudinally of the shaft and adapted to draw said friction surfaces into driving engage ment witheach other, said bolts being secured against longitudinal movement with respectto said loose drum and rotatable relatively thereof, and adapted when slackened to release said friction surfaces from each other.

Signed at Chicago this 22nd day, of April,

OSCAR J. MARTINSON. WVitnesses:

E. A. RUMMLER,

MARY M. DILLMAN. 

